However, a slash or a double slash ( / or // ) at the front of a predicate in square brackets does not have a context and therefore refers to the root of the document.
但是，方括号中谓词前的单斜线或双斜线（/ 或 //）没有上下文，所以引用到文档的根。
This script computes the square root of 5, but since it doesn't store or display the result, it is not very useful.
这个脚本计算了5的平方根，但没存储下来，也没有显示出来，所以就根本没用了。
TRMS electricity isolated sensor is designed for test that can not be tested exactly by average test method, RMS is also root mean square.
真有效值电量传感器是针对平均值测量法不能准确测出其有效值而设计的。有效值又称均方根值（rms）。
TRMS electricity isolated sensor is designed for test that can not be tested exactly by average test method, RMS is also root mean square.
真有效值电量传感器是针对平均值测量法不能准确测出其有效值而设计的。有效值又称均方根值（rms）。
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